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Stack: Difference between revisions
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The '''Stack''' is a buffer which remembers the state of subroutines that are currently executing. | The '''Stack''' is a buffer which remembers the state of subroutines that are currently executing. | ||
On the [[65c816]], the stack is always in [[bank]] zero. It can be thousands of bytes deep.<sup>[1]</sup> | On the [[65c816]], the stack is always in [[bank]] zero.<sup>[3]</sup> It can be thousands of bytes deep.<sup>[1]</sup> | ||
In [[emulation mode]] it wraps within page one.<sup>[2]</sup> | In [[emulation mode]] it wraps within page one.<sup>[2]</sup> | ||
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# https://wilsonminesco.com/816myths | # https://wilsonminesco.com/816myths | ||
# Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.1.1 | # Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.1.1 | ||
# section 2.11 of 65c816 datasheet: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Inherited from 6502]] | [[Category:Inherited from 6502]] | ||
Revision as of 19:33, 10 August 2024
The Stack is a buffer which remembers the state of subroutines that are currently executing.
On the 65c816, the stack is always in bank zero.[3] It can be thousands of bytes deep.[1]
In emulation mode it wraps within page one.[2]
The stack grows towards zero, but the most recently pushed byte is nontheless called the top of the stack. These instructions push things to the stack:
Pulling takes one cycle more than pushing. These instructions pull things from the stack:
Note the lack of PLK. PHS and PLS similarly do not exist.
See Also
References
- https://wilsonminesco.com/816myths
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#5.1.1
- section 2.11 of 65c816 datasheet: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf